Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : wear

Effect of Heat Treatments on The Mechanical Properties And Wear Resistance of Al- Alloy Matrix Composite

Engineering and Technology Journal, 2011, Volume 29, Issue 12, Pages 518-533

Metal matrix composite (MMCs) of the base alloy (Al-0.978%Mg-1.03%Si) reinforced
with SiC particles (10 wt %) with particle size (53-106) μm was prepared by stir casting
using vortex technique. Solution heat treatment and aging are carried out at a constant
temperature of 175C° for different aging times. Many inspections and tests such as
microstructure, Vickers hardness and XRD analysis. Wear test type ( Pin – on – Disc) with
various applied loads and different exposure times at constant parameters was carried out
under dry sliding conditions.
It was found that the addition of SiC particles to base alloy improved the hardness and
wear resistance before and after heat treatment (precipitation hardening).
In addition, using SiC particles with alloy matrix resulted in a faster aging response i.e the
time of peak hardness decreased from 8hr to 5hr for base alloy and composite respectively.
These results indicate that the addition of SiC particles to Al –alloy matrix accelerates the
aging kinetic.

Study of The Mechanical Properties For Particulate Polymer Blend Composite

Engineering and Technology Journal, 2011, Volume 29, Issue 2, Pages 76-85

This research involves using epoxy resin and (Nitride Butadiene Rubber
NBR) to form a blend with different resin ratios (90 – 10)%, (80 – 20)%,
(70 – 30)%, and (60 – 40)% to achieve better ratio for impact strength as a
function of better toughness; then reinforced with SiO2 and Al2O3 powders with
(20%) volume fraction. Mechanical properties were studied including impact
strength, wear resistance, and hardness before and after immersion in water and
HCl (0.5N).
Results showed that the composite (epoxy+NBR+SiO2) had better
properties compared with blend and Al2O3 composite. Also the acid solution had
affected then properties more than water. All impact and wear and hardness
decreased after immersing in solution.

Effect of Different Media on the Corrosion Behavior and Some Mechanical Properties of Al-Zn-Mg Alloy

Majid Hameed Abdulmageed

Engineering and Technology Journal, 2010, Volume 28, Issue 3, Pages 525-536

This work investigates the effect of different media (0.1N of NaOH, H2SO4
and NaCl solution) on the polarization behavior of Al-Zn-Mg alloy and calculates
some of the corrosion parameters such as corrosion potential (Ecorr) and current
density (icorr), cathodic and anodic Tafel slopes (bc & ba), and the polarization
resistance (Rp) .
The results of the polarization resistance indicates that Al-Zn-Mg alloy have
resistance in slat solution higher than that observed in acidic and basic solution
respectively .
Also some of the mechanical properties like the hardness and wear were
measured. The results for hardness showed that the untreated alloy in the
experimental solutions had higher hardness than those which are treated in salt,
acidic , and basic solutions respectively .
While the results for the rate of wear at different sliding speeds showed that the
rate of wear for the samples that treated in basic solution higher than those for
samples which are treated in the acidic and salt solutions . Also the same results
were get when measure the rate of wear with different applying loads.

Effect of Pb and Sn Adding on Dry Sliding Wear Behavior of á-Brass (70/30)

Engineering and Technology Journal, 2009, Volume 27, Issue 7, Pages 258-268

This work is concerned with a study of dry sliding wear of α–Brass (70/30) with
addition of lead and tin(3%wt) for each one alloy. Three brass alloys were prepared by
melting and pouring in steel molds. A Pin -on-Disc technique was used. The effect of
applied loads and sliding times on wear rate were examined. The results show that the
wear rate increases with increasing applied loads and with increasing sliding time at
constant sliding speed (2.7m/s) while hardness of steel disc was 35 HRc .
The results also show that the brass alloy containing 3% tin has more
wear resistance than that of other brass alloys.